SN75LBC176AD RS422/RS485 Half Duplex Transceiver Equivalent & Substitute Parts

Part Overview

The SN75LBC176AD is a half-duplex RS422/RS485 transceiver manufactured by Texas Instruments in 8-SOIC surface mount packaging. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The SN75LBC176AD operates within a 4.75V to 5.25V supply range with a 30Mbps data rate and 50mV receiver hysteresis, designed for industrial communication applications requiring reliable serial data transmission over twisted-pair cabling.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN75LBC176AD
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS422, RS485
Number of Drivers/Receivers	1/1
Duplex Configuration	Half
Data Rate	30Mbps
Voltage Supply Range	4.75V ~ 5.25V
Operating Temperature Range	0°C ~ 70°C
Receiver Hysteresis	50mV
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SN75LBC176AD is determined by the following critical parameters:

Electrical Compatibility Requirements:

RS422/RS485 protocol support
Half-duplex configuration (1 driver / 1 receiver)
4.75V ~ 5.25V supply voltage range
30Mbps or higher data rate capability
50mV receiver hysteresis or compatible threshold

Mechanical Compatibility Requirements:

8-SOIC package footprint (0.154", 3.90mm Width)
Surface mount mounting type
Pin-compatible pinout

Compliance Requirements:

ROHS3 compliance
MSL rating of 1 or 3 (168 Hours)

Substitute parts are grouped into three categories: Direct Manufacturer Equivalents (same base product line from Texas Instruments), Parametric Equivalents (functionally equivalent from alternative manufacturers), and Manufacturer-Recommended Upgrades (enhanced performance alternatives with extended operating ranges or improved specifications).

Parameter Comparison

Part Number	Manufacturer	Product Status	Protocol	Data Rate	Supply Voltage	Operating Temp	Receiver Hysteresis	Package
SN75LBC176AD	Texas Instruments	Obsolete	RS422, RS485	30Mbps	4.75V ~ 5.25V	0°C ~ 70°C	50mV	8-SOIC
SN65LBC176ADR	Texas Instruments	Active	RS422, RS485	30Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	50mV	8-SOIC
SN75LBC176ADR	Texas Instruments	Obsolete	RS422, RS485	30Mbps	4.75V ~ 5.25V	0°C ~ 70°C	50mV	8-SOIC
SN75LBC176D	Texas Instruments	Obsolete	RS422, RS485	30Mbps	4.75V ~ 5.25V	0°C ~ 70°C	50mV	8-SOIC
LTC1481IS8#PBF	Analog Devices Inc.	Active	RS422, RS485	2.5Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	45mV	8-SOIC
LTC1481IS8#TRPBF	Analog Devices Inc.	Active	RS422, RS485	2.5Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	45mV	8-SOIC
SP485EN-L	MaxLinear, Inc.	Active	RS422, RS485	5Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	10mV	8-SOIC
SP485EN-L/TR	MaxLinear, Inc.	Active	RS422, RS485	5Mbps	4.75V ~ 5.25V	-40°C ~ 85°C	10mV	8-SOIC
ISL3179EIBZ	Renesas Electronics Corporation	Active	RS422, RS485	40Mbps	3V ~ 3.6V	-40°C ~ 125°C	28mV	8-SOIC
ISL3179EIBZ-T	Renesas Electronics Corporation	Active	RS422, RS485	40Mbps	3V ~ 3.6V	-40°C ~ 85°C	28mV	8-SOIC
ISL43485IBZ	Renesas Electronics Corporation	Active	RS422, RS485	50Mbps	3V ~ 3.6V	-40°C ~ 85°C	50mV	8-SOIC

Engineering Selection Recommendations

Direct Manufacturer Equivalents (Texas Instruments):

The SN65LBC176ADR represents the primary direct equivalent, offering identical electrical specifications (30Mbps data rate, 50mV hysteresis, RS422/RS485 protocol) with extended operating temperature range (-40°C to 85°C versus 0°C to 70°C) and active product status. This part is recommended for applications requiring long-term supply continuity and identical performance characteristics. The SN75LBC176ADR and SN75LBC176D provide pin-compatible alternatives within the same product line, though both retain obsolete status.

Parametric Equivalents (Alternative Manufacturers):

The LTC1481IS8#PBF and LTC1481IS8#TRPBF from Analog Devices maintain full RS422/RS485 protocol compatibility and identical supply voltage range. These parts feature active product status and extended temperature range (-40°C to 85°C). The reduced data rate (2.5Mbps versus 30Mbps) and lower receiver hysteresis (45mV versus 50mV) are suitable for applications not requiring maximum bandwidth.

The SP485EN-L and SP485EN-L/TR from MaxLinear provide RS422/RS485 compatibility with active status and extended temperature range. The reduced data rate (5Mbps) and lower hysteresis (10mV) accommodate lower-speed communication requirements with improved noise immunity.

Manufacturer-Recommended Upgrades (Enhanced Performance):

The ISL3179EIBZ and ISL3179EIBZ-T from Renesas Electronics offer superior data rate performance (40Mbps) and extended temperature range (-40°C to 125°C for the base model). These parts operate at reduced supply voltage (3V to 3.6V) and require circuit redesign for voltage compatibility. The ISL43485IBZ provides the highest data rate (50Mbps) with 50mV hysteresis matching the original specification, also requiring 3V to 3.6V supply voltage adaptation.

All recommended substitutes maintain ROHS3 compliance and appropriate MSL ratings for surface mount assembly.

Frequently Asked Questions (FAQ)

Q: Can the SN75LBC176AD be directly replaced with the SN65LBC176ADR?

A: Yes. The SN65LBC176ADR is a direct equivalent with identical electrical specifications and package footprint. The primary advantage is active product status and extended operating temperature range (-40°C to 85°C). Pin configuration and signal levels are fully compatible.

Q: What is the key difference between the Texas Instruments SN75LBC176AD and the Analog Devices LTC1481IS8#PBF?

A: Both devices support RS422/RS485 protocols with identical 4.75V to 5.25V supply voltage and 8-SOIC packaging. The primary difference is data rate: the SN75LBC176AD operates at 30Mbps while the LTC1481IS8#PBF operates at 2.5Mbps. The LTC1481 is suitable for lower-speed applications and offers active product status with extended temperature range.

Q: Are the Renesas ISL3179EIBZ and ISL43485IBZ direct replacements?

A: These Renesas parts are not direct replacements due to supply voltage differences. The ISL3179EIBZ and ISL43485IBZ require 3V to 3.6V supply voltage versus the SN75LBC176AD's 4.75V to 5.25V requirement. Circuit redesign is necessary to accommodate the lower supply voltage. However, both offer superior data rate performance (40Mbps and 50Mbps respectively) and extended temperature ranges.

Q: What packaging options are available for substitute parts?

A: All substitute parts maintain the 8-SOIC (0.154", 3.90mm Width) surface mount package footprint. Packaging formats vary by part number: Tube, Cut Tape (CT) & Digi-Reel®, and Tape & Reel (TR) options are available across the substitute lineup to accommodate different procurement and assembly requirements.

Q: Which substitute part offers the best long-term availability?

A: The SN65LBC176ADR from Texas Instruments is recommended for long-term availability due to active product status and high inventory levels (22,661 pieces). The Renesas ISL3179EIBZ-T and ISL43485IBZ also offer active status with substantial inventory (35,200 and 7,746 pieces respectively).

Q: Can I use the SP485EN-L/TR as a drop-in replacement?

A: The SP485EN-L/TR is pin-compatible and maintains RS422/RS485 protocol support with identical 4.75V to 5.25V supply voltage and 8-SOIC packaging. The reduced data rate (5Mbps versus 30Mbps) and lower receiver hysteresis (10mV versus 50mV) are suitable for applications not requiring maximum bandwidth. Functional testing is recommended to confirm compatibility with specific application requirements.

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